just reading Tim's Take on Bravo's PR site (he's answering viewer questions since there wasn't a new episode last night) and i came across this:

Q: Alison's model is PLUS SIZE??? Is it numerically literal now? Is anything over size 0 plus now?A: Well, you're close. Alison's model Alexandra is probably a 6. Regrettably, it puts her in the "plus size" end of the runway equation.

yeah, he mentions that, but i don't feel any better about it:"I called her "zaftig," and I want to explain my concern. The success of Alison’s recycling outfit was dependent upon a very cinched waist. That wasn’t going to happen on Alexandra, given the particulars of her figure."